Quote:
Originally Posted by Sdgood1
Hi all, just another tire pressure question. On your TV (mines an f250) What pressure do you use?? The max tire pressure, or what is recommended on the door frame? Tires are 80 psi E rated, but the tire inflation sticker says 65 psi?
I've always ran them for whatever load I have. Empty 65psi, loaded with fifth wheel and incidentals run them up to 75 to 80. I have NEVER had a problem with this theory of mine.  WE really don't need to get to deep in this, just curious as to what you do! |
For your truck, the Original Equipment tires (OE) must have a load capacity equal to the GAWR they are fitted to. The truck’s building instructions require the manufacturer to provide a percentage of load capacity reserves. Look at tour truck’s certification label and you will see that the GAWRs when totaled have more load capacity than the vehicle GVWR, that’s load capacity reserves. Find an inflation chart for your tires and add the load capacity they are providing at the vehicle manufacturer’s recommended cold inflation pressures. If higher than the GAWRs load capacities, that’s load capacity reserves. Unless your truck has a second tire inflation pressure placard for heavy loads – up to GVWR – the certified recommended inflation pressures are good for all load conditions up the vehicle max which is GVWR.
The load inflation chart for your tires will show the load capacity of those tires at vehicle manufacturer recommended cold inflation. Because they are Passenger tires the vehicle manufacturer has already made the mandatory deduction for Passenger tires when fitted to a pick-up truck.
Logic: The vehicle manufacturer’s instruction to provide a percentage of load capacity reserves is also a tire industry standard (USTMSA). Those standards I’m using are from and for the consumer automotive industry and are not to be confused with tire inflation regulations from the trucking industry (FMCSA), one is not applicable to the other.
Inflating to the load carried defeats the advantage of having load capacity reserves.
Tire industry standards allow optional tire inflations from what has been recommended by the vehicle manufacturer all the way to the inflation pressure shown on the tire sidewall which will provide maximum load capacity from the tire.
The tire industry also says to NEVER use inflation pressures less than what has been recommended on the vehicle certification label.